Skiving machines



May 1, 1962 o. c. BRETT, JR

SKIVING MACHINES 3 SheetsSheet 1 Filed April 18, 1961 Inventor 01 we)"6'. Brett Jr: By hzs/htorney May 1, 1962 o. c. BRETT, JR 3,031,873

SKIVING MACHINES Filed April 18, 1961 3 Sheets-Sheet 2 Z 4 6 14 W W 1112 M k M y 1962 o; b. BRETT, JR 3,031,873

SKIVING MACHINES Filed April 18, 1961 3 Sheets-Sheet 3 Unite i grates3,031,873 SKIVING MACIENES Oliver C. Brett, In, West Boxford, Mass.,assignor to United Shoe Machinery Corporation, Flemington, NJ., acorporation of New Jersey Filed Apr. .18, 1961, Ser. No. 103,934 9Claims. (Cl. 69-16) This invention relates to skiving machines ingeneral and more particularly to machines which will produce a scarfcontaining a groove. One type of skiving machine which has been incommercial use for many years is made in accordance with United StatesPatents Nos.

1,652,513 and 1,866,918, granted to Milton H. Ballard, December 13,1927, and July 12, 1932, respectively. In the Ballard type skiver, awork piece, often shoe upper leather, is fed to a rotary disk knife by afeed roll and a presser member which urges the work piece against theroll. The edge of the disk knife is located in close proximity to theupper edge of the roll whereby a scarf is cut on the work pieceimmediately as it emerges from between the roll and the presser member.The angle of the scarf may be varied by varying the relative angularpositions of the knife and roll.

To vary the angular relationship in a machine made in accordance withthe above-identified Ballard patents,

the feed roll is mounted in a carrier which is angularly adjustablerelative to the knife. The presser member is also mounted on thecarrier, so that its relationship to the roll remains constant. It is,therefore, possible on the Ballard machine to produce a feather edgescarf, a flat or shoulder scarf, as well asrcombinations of both, byangular adjustment of the carriage which is accomplished by treadleoperation.

On a bal shoe upper both types of scarfs are frequent; ly required. Afeather edge scarf is formed along the lower margin where it extendsbeneath and is sewed to the upper margin of the vamp. A shoulder scarfis formed along the upper margin where it is folded over to make afinished top edge for the shoe. When relatively stiff heavy leathers areused for shoe uppers, the folding operation is simplified and the finalproduct is substantially improved if a groove is formed in the scarf onthe flesh side of the leather along the line where it is to be folded.

Accordingly, one object of this invention is to provide a skivingmachine capable of producing a scarf containing a groove.

Another object of the invention is to provide a skiving machine capableof producing a scarf either with or without a groove, depending onoperator selection.

Still another object of this invention is to provide a skiving machinecapable of producing a groove in either a feather edge or shoulder scarfor combination of both.

A further object of this invention is to provide a skiving machinecapable of automatically producing a groove in a scarf, the depth of thegroove being directly related to the angle of the scarf.

The invention is hereinafter illustrated in a machine similar to thatshown in the above-identified Ballard patents to which attention isdirected for a complete description of the skiving instrumentalities andtheir operating mechanisms. As a feature of this invention, there isprovided a riser in the form of a dog or similar projection extendingfrom a slot in the periphery of the feed roll toward the presser member.As the work piece is fed by the feed roll over the riser, an elongatedarea of intensified compression is produced which, when presented to theskiving knife, results in a groove being formed in the skived surface.The riser in its operative position is in alignment with the pressermember which may be slotted to facilitate formation of a bulge rather I3,031,873 Patented May 1,1962

than a compressed area which results in a narrower deeper groove.

During the time the riser is in operative position to form the bulge orcompressed area, it is stationary with respect to the feed roll andpresser member. Were the riser, on the other hand, an annular rib formedon the feed roll and therefore rotatable with the roll, it would beimpossible to form a scarf that did not contain a groove. In order notto limit the machine to the production of grooved scarfs, the riser issecured to an arcuate plate which is adjustable within a slot in theperiphery of the feed roll. By rotating the plate, the riser may bemoved away from the presser member and knife into an inoperativeposition. Means are also provided on the machine to lock the plate andconsequently the riser in its inoperative position.

Since it is more frequently required to form a groove in a shoulderscarf than in a feather edge scarf, the riser plate is linked to thecarrier which mounts the feed roll so that the riser is automatically inoperative position to form the bulge or compressed area, and hence, agroove of maximum depth, when the axis of the feed roll is parallel tothe skiving knife, i.e., the position which produces a shoulder scarf.When the machine is treadled to vary the angle of the feed roll for theformation of a feather edge scarf, the riser is proportionatelywithdrawn from vertical alignment with the presser member. When thecarriage is moved only a slight amount to produce a tapered shoulderscarf, i.e., one that has a slight shoulder and tapers almost to afeather edge, the riser is withdrawn a proportionate amount fromvertical alignment with the presser member resulting in a groove oflesser depth. Full trcadling of the machine results in a full featheredge scarf with complete withdrawal of the riser and hence no groove. Inorder to render theriser completely inoperative in any portion ofangular adjustment of the feed roll, manual means are provided forlocking the plate and its riser out of operative position whereby nogroove is produced.

The above and other features of the invention including various noveldetails of construction and cornbinations of-parts will now be moreparticularly described with reference to the accompanying drawings andpointed out in the claims. It will be understood that the particularmachine embodying the invention is shown by way of illustration only andnot as a limitation of the invention. The principles and features ofthis invention may be employed in varied and numerous embodimentswithout departing from the scope of the invention.

In the drawings,

FIG. 1 is a rear elevation of the operating instrumentalities of askiving machine of the Ballard type incorporating the invention;

FIG. 2 is a right side elevation of the portion of the machine shown inFIG. 1;

FlGS. 3 and 4 are enlarged schematic views of the feed roll and pressermember of the machine'cooperating to feed a work piece to be skived,FIG. 3 showing a slotted presser member and FIG. 4 a flat pressermember;

FIGS. 5 and 6 are sectional views, on enlarged scale, of work piecesskived by the machine employing the mechanism shown in FIGS. 3 and 4,respectively;

FIGS. 7 and 8 are sectional views of a conventional flat or shoulderscarf, the FIG. 8 scarf having a groove;

FIGS. 9 and 10 are sectional views of the scarfs shown in FIGS. 7 and 8,respectively, after they have been folded;

FIGS. 11 and 12 are sectional views of a conventional feather edgescarf, the FIG. 12 scarf having a groove;

FIGS. 13, l5, l7 and 19 are schematic front elevational views of theskiving instrumentalities of the machine in various relative positions;and,

3 FIGS. 14, 16, 18 and 20 are schematic side elevational views showingthe corresponding positions of adjustment of the riser.

Referring first to FIGS. 7 through 12, there are shown sectional viewsof various scarfs which may be produced on machines embodying thepresent invention. FIG. 7 illustrates a work piece W having a flat orshoulder scarf. The skived portion 2 is approximately one-half thethickness of the unskived portion 4. After the work piece is skived itis subsequently folded as shown in FIG. 9, with the free end 6 abuttingthe shoulderS. Note in FIG. 9 that the fold 1t) bulges and therebyproduces a margin which is somewhat thicker than the unskived portion 4of the work piece. This is particularly prevalent when relatively stiffleather is folded.

FIG. 8 shows a flat or shoulder scarf similar to FIG. 7 but providedwith a longitudinal groove 12 formed 'by a machine embodying theinvention. Forming a groove in the scarf is advantageous since it takesthe inherent fight or tendency to return to unfolded condition out ofthe leather. When this scarf is folded along the groove 12 as shown inFIG. 10, not only is the folding process made easier but the fold 14does not bulge and is virtually the same thickness as the unskivedportion 4 of the work piece which is more desirable than the FIG. 9fold. FIG. 11 is a sectional view of a work piece W provided with afeather edge scarf 16. FIG. 12 shows a scarf similar to that of FIG. 11but provided with a longitudinal groove 18 also formed by a machineembodying the invention. It will be noted that the groove 18 is widerand shallower than the groove 12 of FIG. 8. Although a feather edgescarfs are not as frequently required to be folded, they may be foldedin the same manner as the shoulder scarfs of FIGS. 7 and 8 withcomparable results.

Referring next to FIGS. 1 and 2, there are shown rear and right sideelevational views respectively of the operating instrumentalities of askiving machine similar to that disclosed in the above-identifiedBallard patents to which reference may be had for a more detaileddescription of the entire .machine. Briefly, the machine includes arotary disk skiving knife 20 which is mounted on a shaft 22. While theknife is shown in the above-identified Ballard patents to be adjustable,for the purposes of this invention it may be considered to be stationaryand rotated about the axis of the shaft 22 with its cutting edge in aplane P. A feed roll 24 is mounted on a shaft 26 journaled in a bracket28 and driven from a pulley 30 by a belt (not shown). Cooperating withthe feed roll 24 is a feed disk 32 similar to those shown in the Ballardpatents. The work is fed out of the plane of the drawings and toward theviewer as seen in FIG. 1 and from right to left as seen in FIG. 2. Apresser member 34 urges the work piece against the periphery of the feedroll 24. The presser member is mounted on a stud 36 which is adjustablysecured in a bracket 38 which, although not shown in the drawings, issecured to the feed roll bracket 28. The presser member 34 is urgeddownwardly relatively to the bracket 38 and toward the feed roll 24 by acoil compression spring 40. An edge gage 42 depends from the pressermember bracket 38 and is engageable with the work piece adjacent theleft-hand edge of the feed roll 24. The edge of the knife 20 is locatedin close proximity to the upper periphery of the feed roll 24 wherebythe scarf is cut on the work piece immediately as it emerges frombetween the roll and the presser member 34 traveling from right to leftas seen in FIG. 2.

As described in the Ballard patents, the feed roll and the pressermember are adjustable to vary the angle at which the work piece ispresented to the plane P of the knife 20. The feed rol-l bracket 28 ismounted on a carrier bracket 44 by a conventional slot and screwconnection 46. The carrier bracket is secured to an arcuate dovetailcarrier 48 which is slidable in guides 50, 52 secured to a portion 54 ofthe main machine frame. One end of a treadle rod 56 is connected to atreadle (not shown) and the other end is pivoted on a pin 58 fitted in aslotted forward portion of the carrier 48. When the machine is treadled,the rod 56 advances or retracts the carrier 43 relative to the machineframe. By this mechanism the axis of the feed roll 24 and hence itsperiphery is adjustable relative to the knife plane P has shown in FIGS.l3, 15, 17 and 19 to produce either ashoulder scarf, a feather edgescarf or combinations of both. The amount of angular adjustment isindicated by a pointer 6% on a scale 62.

As a feature of this invention, there is provided a riser 64 in the formof a dog projecting from the periphery of the feed roll 24 toward thepresser member 34. The riser is formed on a substantially U-shaped plate66 which fits slidably within a groove 68 in the feed roll.

The ends of the plate 68 are joined by a linking member 70 which isattached to a rearwardly projecting finger '12. An operating lever 74 ispivoted on a stud 76 threaded into the frame portion 54. The upper edgeof the operating lever 74 is engageable with the lower edge of thefinger 72 to impart movement to the plate 66 and riser 64. The finger 72is normally held in engagement with the operating lever 74 by a spring78 stretched between the linking member 70 and a block 80 secured to thecarrier guide 50.

Vertical alignment between the riser 64 and the presser member 34, asseen in FIG. 2, is obtained by rotating an adjusting screw 82 engageablewith the lower edge of the operating lever 74 and threaded in the block80. A lock 84 secures the screw 82 in any desired position.

Motion is transmitted to the operating lever 74 from the carrier 48 byan eccentric stud 86 threaded in the carrier bracket 44 and engageablewith the lower surface of the lever 74. The amount of angulardisplacement of the riser 64 from the solid to broken line positionsshown in FIG. 2 when the carrier is moved is controlled by rotating theeccentric stud 86.

The riser operating mechanism may be rendered inoperative at the optionof the operator by the movement of a bell crank lever 90 from the solidto broken line positions shown in FIG. 1. The lever 90 is pivoted on astud 92 threaded in the block 80 with its lower arm held by a tensionspring 94 in engagement with a stud 96 also threaded in the block. Theends of the spring 94 are secured to the upper arm 98 and the block 80.When the operator moves the lever 90 from the solid to broken linepositions, the spring passes dead center of the stud 92 and the end ofthe upper arm 98 engages the operating lever 74 elevating it to thebroken line position thereby rotating the riser plate 66 in a clockwisedirection to withdraw the riser from vertical alignment with thepressure member 34. By selective use of the lever 90, the operator isable to prevent a groove from being formed in the scarf at whateverangle the feed roll is positioned relative to the knife plate.

The pressure member 34 is seen in FIGS. 1 and 3 to include a slot 100 invertical alignment with the riser 64. The presser member may also beunslotted as shown in FIG. 4 depending upon the type of groove it isdesired to produce. The feed roll 24 and the pressure member 34 normallytend to compress the work piece W slightly as it is fed to the skivingknife and if it is desired to produce a relatively broad and shallowgroove 12' (FIG. 6) an unslotted .presser member 34 would be employed.As the work piece moves between the feed roll and presser member, theriser '64 produces an elongated area of in: tensified compression asshown in FIG. 4 which, when cut by the skiving knife, results in agreater depth of stock being removed from the compressed area than theremaining portion of the scarf. However, where it is desired to producea narrower and deeper groove 12 as shown in FIG. 5, a slotted pressermember is employed. Here the riser 64 cooperates with the slot 100 inthe presser member to form an elongated bulge in the flesh side of thework piece.

The relationshipof the angle of the scarf to the posi* tion of the riserwill now be described with reference to FIGS. 13 to 20. Since it is morefrequently advantageous to form a groove in a'shoulder scarf than in afeather edge scarf, the riser plate 66 is positioned by the carrier 48so that the riser is automatically in operative position to form thebulge or compression area, and hence, a groove of maximum depth when theaxis. of the feed roll is parallel to the plane P of the skiving knife,i.e., the position which is represented by FIGS. 13 and 15. In FIG. 16the riser 64 will be seen to be in vertical alignment with the groovedpresser member 34. However, in FIGS. 13 and 14, the riser is withdrawnfrom alignment which represents the positions the riser will occupy whenthe manual selecting lever 90 has disengaged the operating lever 74 fromthe carrier, i.e., the position in which no groove will be formed. FIGS.17 and 18 show the feed roll 24 in position relative to the knife toproduce a feather edge scarf. In this position the riser isautomatically rotated by the carrier through the eccentric 86 and thelever 74 into an inoperative position similar to that which it occupiesin FIG. 14. FIGS. 19 and 20 show the riser in an intermediate positionwhere the machine has been partially treadled to produce a taperedshoulder scarf and wherein the riser is only partially withdrawn fromvertical alignment with the presser member thereby resulting in lesscompression of the work piece and hence a shallower, wider groove.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, and a rigid work engaging riser projecting from a slotin the periphery of the feed roll toward the presser member for'creatingbetween them an elongated area of intensified compression in the workpiece whereby the skiving knife cuts a grooved scarf.

2. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the Work piece as it emerges from between the feed roll and thepresser member, a rigid work engaging riser projecting beyond theperiphery of the feed roll toward the presser member, and a slot in thepresser member in alignment with the riser, said slot and riser creatingbetween them an elongated bulge in the work piece whereby the skivingknife cuts a grooved scarf.

3. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a rigid Work engaging riser projecting beyond theperiphery of the feed roll toward the presser member for creatingbetween them an elongated area of intensified compression in the workpiece whereby the skiving knife cuts a grooved scarf, and selectivelyoperated means for rendering said riser inoperative to form a groove inthe scarf.

4. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefee-d roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a movable carrier mounting the feed roll for adjustmentrelative to the skiving knife to vary the angle of the scarf, a workengaging riser projecting beyond the periphery of the feed roll towardthe presser member for creating between them an elongated area ofintensified compression in the work piece whereby the skiving knife cutsa grooved scarf, and means operative in response to movement of themovable carrier for automatically adjusting the riser relative to thepresser member to vary the amount of compression in the work piecewhereby the depth of the groove varies automatically with the angle ofthe scarf.

5. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a movable carrier mounting the feed roll for adjustmentrelative to the skiving knife to vary the angle of the scarf, a workengaging riser projecting beyond the periphery of the feed roll towardthe,

presser member for creating between them an elongated area ofintensified compression in the work piece whereby the skiving knife cutsa grooved scarf, means operative in response tomovement of the movablecarrier for automatic adjustment relative to the presser member to varythe depth of the groove in accordance with the angle of the scarf, andselectively operated means for operatively disconnecting the riser fromthe carrier and rendering it ineffective in compressing the work pieceto eliminate the groove from the scarf.

6. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges between the feed roll and thepresser member, a work engaging riser projecting beyond the periphery ofthe feed roll toward the presser member to form an elongated area. ofintensified compression in the work piece whereby the skiving knife cutsa grooved scarf, an arcuate plate mounting the riser and movable withinan annular depression in the feed roll, and means for rotating the platefrom a position where the riser is opposite the presser member to formin the work piece an area of maximum compression through intermediatepositions to an inoperative position Where the riser is spacedsufliciently from the presser member as not to compress the work piece.

7. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a movable carrier mounting the feed roll for adjustmentrelative to the skiving knife to vary the angle of the scarf, a workengaging riser projecting beyond the periphery of the feed roll towardthe presser member for creating between them an elongated area ofintensified compression in the work piece whereby the skiving knife cutsa grooved scarf, an arcuate plate mounting the riser and movable withinan annular depression in the feed roll, and means operated by themovable carrier for automatically adjusting the plate to vary the depthof the groove in accordance with the angle of the scarf.

8. A skiving machine having, in combination, a feed roll engageable witha Work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent thefeed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a movable carrier mounting the feed roll for adjustmentrelative to the skiving knife to vary the angle of the scarf, a workengaging riser projecting beyond the periphery of the feed roll towardthe presser member, a slot in the presser member in alignment with theriser, said slot and riser creating between them an elongated bulge inthe work piece whereby the skiving knife cuts a grooved scarf, anarcuate plate mounting the riser and movable within an annulardepression in the feed roll, and

means operated by the movable carrier for automatically 7 adjusting theplate from a position where the riser is opposite the slot in thepresser member to create a bulge of maximum magnitude throughintermediate positions to an inoperative position where the riser isspaced sufliciently from the presser member so as not to create a,

bulge.

9. A skiving machine having, in combination, a feed roll engageable witha work piece, a presser member for urging the work piece against thefeed roll, a skiving knife positioned adjacent the feed roll to cut ascarf on the work piece as it emerges from between the feed roll and thepresser member, a movable carrier mounting the feed roll for adjustmentrelative to the skiving knife to vary the angle of the scarf, a workengaging riser projecting beyond the periphery of the feed roll towardthe presser member, a slotin the presser member in alignment with theriser, said slot and riser creating between them an elongated bulge inthe work piece whereby the skiving knife cuts a grooved scarf, anarcuate plate mounting the riser and movable within an annulardepression in the feed roll, means operated by the movable carrier forautomatically adjusting the plate from a position where the riser isopposite the slot in the presser member to create a bulge ofmaximum'magnitude through intermediate positions to an inoperativeposition where the riser is spaced sufficiently from the presser memberso as not to create a bulge, and means for locking the riser in saidinoperative position.

No references cited.

